[PostGIS] #5623: unpackaged upgrade from PostGIS 3.2 failing on ST_AsGeoJSON

[PostGIS]

#5623: unpackaged upgrade from PostGIS 3.2 failing on ST_AsGeoJSON
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  Reporter:  robe          |      Owner:  strk
      Type:  defect        |     Status:  new
  Priority:  blocker       |  Milestone:  PostGIS 3.5.0
 Component:  upgrade/hard  |    Version:  master
Resolution:                |   Keywords:
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Comment (by strk):

 I could reproduce, locally, with:
 {{{
 regress/run_test.pl -v --dumprestore --upgrade-path unpackaged3.2--:auto
 regress/core/regress
 ERROR:  function "st_asgeojson" already exists with same argument types
 }}}

 The upgrade script is clearly not finding a match for the identity passed
 to {{{ _postgis_drop_function_by_identity }}}
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5623#comment:2>
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